Computer-aided polyp detection based on image enhancement and saliency-based selection
Publication date: January 2020Source: Biomedical Signal Processing and Control, Volume 55Author(s): Farah Deeba, Francis M. Bui, Khan A. WahidAbstractThis paper presents a computer-aided polyp detection algorithm applicable to both colonoscopy and wireless capsule endoscopy (WCE). The proposed system has three integral parts: image enhancement, saliency map formation and Histogram of gradients (HOG) feature extraction for final classification. We propose a novel and efficient image enhancement algorithm, which enhances the saliency of clinically important features in endoscopic images. A saliency detection method is applied to the enhanced images to highlight the initial polyp candidates. In the classification stage, polyp candidates are selected after performing an image enhancement step and a saliency detection step. Exhaustive experiments have been performed on three publicly available databases: CVC ColonDB, CVC ClinicDB, and ETIS Larib to evaluate the performance of the proposed polyp detection algorithm. Comparison with the state-of-the-art methods shows that the proposed method outperforms the existing ones in terms of recall (=86.33%) and F2 score (=75.51%) for CVC ColonDB and in terms of recall (=74.04%) for the ETIS Larib dataset. With a significantly reduced number of search windows resulting from the saliency-based selection, the proposed scheme ensures a cost-effective and efficient polyp detection algorithm.
Incomplete resection of colorectal neoplasia decreases colonoscopy efficacy. Conventional resection (CR) of polyps, performed in a gas-distended colon, is the current standard, but incomplete resection rates of approximately 2% to 30% for nondiminutive (>5 mm), nonpedunculated lesions are reported. Underwater resection (UR) is a novel technique. The aim of this study was to determine the incomplete resection rates of colorectal lesions removed by UR versus CR.
Conclusion Endocuff-assisted colonoscopy reduces the duration of polypectomy, which may be due to a more stable scope position during resection. Further studies are needed to investigate whether comparable effects will be seen for other interventions, such as clipping or biopsy sampling. [...] © Georg Thieme Verlag KG Stuttgart · New YorkArticle in Thieme eJournals: Table of contents | Abstract | Full text
ConclusionsA focused training intervention was associated with a strong trend toward increased ADRs among certified endoscopists. While the described training interventions definitely show promise, further efforts around continuing professional developments activities are needed to more consistently improve ADRS among certified endoscopists.
AbstractBackgroundColorectal cancer is the fourth most commonly diagnosed cancer in the United States. Approximately 3 –10% of the population has an increased risk for colorectal cancer due to family history and warrants more frequent or intensive screening. Yet,
Conclusions: Solitary PJPs did not recur in this study. Although examination of the entire gastrointestinal tract using esophagogastroduodenoscopy, enteroscopy, and colonoscopy is desirable to exclude Peutz-Jeghers syndrome, follow-up endoscopy after endoscopic polyp resection may be unnecessary, once the diagnosis of a solitary PJP is made. PMID: 31582972 [PubMed]
Conclusion: Second-generation capsule colonoscopy is a safe, noninvasive, and sensitive method for colorectal neoplasia detection although CC remains the preferred method for considerable proportion of subjects. CCE2 may therefore be accepted as the primary screening test for colorectal cancer screening. PMID: 31565052 [PubMed]
Conclusion BLI increased adenoma detection rate compared to WLI. NICE and JNET classifications can be applied when using BLI for endoscopic diagnosis of HP and LGD but histological confirmation remains crucial. [...] © Georg Thieme Verlag KG Stuttgart · New YorkArticle in Thieme eJournals: Table of contents | Abstract | open access Full text
We describe the prevalence of colorectal adenomas determined by a single high detecting colonoscopist using high definition colonoscopes.
Endosc Int Open 2019; 07: E1051-E1060 DOI: 10.1055/a-0953-1787 Background and study aims Prophylactic endoscopic clips are commonly placed during polypectomy to reduce risk of delayed bleeding, although evidence to support this practice is unclear. Our study aimed to: (1) identify variables associated with prophylactic clip use; (2) explore variability between endoscopists’ clipping practices and (3) study temporal trends in prophylactic clip use. Patients and methods This was a retrospective cohort study in a high-volume unit dedicated to screening-related colonoscopies. Colonoscopies involving polyp...
Quality control can decrease variations in the performance of colonoscopists and improve the effectiveness of colonoscopy to prevent colorectal cancers. Unfortunately, routine quality control is difficult to carry out because a practical method is lacking. The aim of this study was to develop an automatic quality control system (AQCS) and assess whether it could improve polyp and adenoma detection in clinical practice.